On Jan 21, 2012, at 3:18 PM, pansophy wrote:
I am trying to create a loop that will perform a series of
analyses. I am
using geeglm from geepack, which fails if there are any null values.
Creating a subset solves this, but do not seem to be able to set the
subset
dynamically based on a changing variable.
This is an exercise in guesswork since you have not provided the data
structures that you are accessing.
while (j <= y.num) {
If you want to avoid NULL values in sequences you can use seq_along()
strSubset = as.character(df.IV$IV[j]) #Gives column name in
quotes
Is there really a dataframe named 'df.IV' or are you perhaps an
expatriate from another programming locale where the "." is an
accessor operator?
df.data.sub = subset(df.data, strSubset>=0)
#subset dataset is not created
`subset` uses nonstandard evaluation. It's very handy for interactive
work but for programming you cannot use it in the manner you imagine.
Try instead:
df.data.sub =df.data[ df[["IV"]] >= 0 )
Or perhaps:
df.data.sub =df.data[ df[[strSubset]] >= 0 )
Although I'm not sure what `strSubset` will evaluate to in your
situation.
# analyses on subset take place
j = j + 1
}
If I type the variable name in the formula it works, so I assume
that I am
not creating the variable in a manner that allows it to be evaluated
in the
subset function.
That much is certain.
--
David Winsemius, MD
West Hartford, CT
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